"Mr. K.V.B.L." wrote in message
news:1188594339.240236.113190@w3g2000hsg.googlegro ups.com...
> We are an ASP. On our system, we have multiple companies running all
> on one partition. There is a piece of software from a third party
> that resets the time for a particular user based on what time zone
> they are physically located. This piece of software is failing
> because of some bug in the license code, so we were trying to mock up
> something that changes the system time for the user and saving us a
> support call. The time offset comes from a data area. So, use
> gettimeofday(), add to tv_sec the offset and then set with
> settimeofday(). This is setting a clock but not the one we want.
>
> Anybody have a guess as to how this third party software is working?
> We don't want to set the global system time, obviously.
>
> I'll attach a C program I wrote. It works, but not the way we want.

You don't say what release you are running, but before v5r3, settimeofday
set a "software clock" (affecting the value retrieved by gettimeofday) and
didn't change the system clock. Since v5r3, settimeofday sets the system
clock. The v5r3 memo to users
(http://publib.boulder.ibm.com/infoce...zahg/rzaq9.pdf)
discusses alternate APIs (Qp0zSetTimeOfDay, etc.) for clients that still
want support for a software clock (without modifying the system clock).

P.S. Although recent releases have added support for timezone/local time as
a system value, I don't believe the support has (yet?) been extended to
allow each job to have its own timezone/local time. I'm not sure whether
the "software clock" support mentioned above is machine-wide or specific to
one job.

--
George Timms
IBM Rochester

Mr. K.V.B.L. wrote:
> We are an ASP. On our system, we have multiple companies running all
> on one partition. There is a piece of software from a third party
> that resets the time for a particular user based on what time zone
> they are physically located. This piece of software is failing
> because of some bug in the license code, so we were trying to mock up
> something that changes the system time for the user and saving us a
> support call. The time offset comes from a data area. So, use
> gettimeofday(), add to tv_sec the offset and then set with
> settimeofday(). This is setting a clock but not the one we want.
>
> Anybody have a guess as to how this third party software is working?
> We don't want to set the global system time, obviously.
>
> I'll attach a C program I wrote. It works, but not the way we want.
>
> #include
> #include
> #include
> #include
> #include
> #include
> #include
> #include
> #include
>
>
> #define SWAP_CHAR( x, y ) {char c; c = x; x = y; y = c;}
>
> typedef struct {
> Qwc_Rdtaa_Data_Returned_t q;
> _Decimal(6,0) dec;
> } my_QWCRDTAA;
>
> typedef struct {
> Qus_EC_t ec_fields;
> char Exception_Data[100];
> } error_code_t;
>
> error_code_t error_code;
>
>
> void SendMsg(char *usr, char *msg_text);
> void SendMsgf(char *usr, char *fmt, ...);
>
>
> void reverse(char t[])
> {
> int i,j;
>
>
> for (i = 0, j = strlen(t) - 1; i < j; i++, j--) {
> SWAP_CHAR(t[i], t[j]);
> }
> }
>
>
> void SendMsg(char *usr, char *msg_text)
> {
> int msg_sent, funcreq;
> char msgtype[10];
> char delivmd[10];
> char usrProfiles[1][10];
> char display[1];
> char msgq[20];
> char usrfield[4];
> char junk[30];
> error_code_t ec;
>
>
> /*
> Variable initialization. The AS/400 APIs are picky about that
> sort of thing. :-)
> */
> sprintf(junk, "%-10.10s", usr);
> strncpy(usrProfiles[0], junk, 10);
> display[0] = 'N';
> strncpy(usrfield, "*USR", 4);
> strncpy(msgtype, "*INFO ", 10);
> strncpy(delivmd, "*NORMAL ", 10);
> memset(msgq, ' ', 20);
>
> ec.ec_fields.Bytes_Provided = sizeof(error_code_t);
>
> QEZSNDMG(msgtype, delivmd, msg_text, strlen(msg_text),
> usrProfiles, 1, &msg_sent, &funcreq, &ec, display, msgq, usrfield);
> if (ec.ec_fields.Bytes_Available != 0) {
> SendMsgf("QSYSOPR", "sendmsg() LINE %d - QEZSNDMG failed with
> code %s", __LINE__, ec.ec_fields.Exception_Id);
> }
> }
>
>
> void SendMsgf(char *usr, char *fmt, ...)
> {
> char string[1000];
>
> va_list arg_ptr;
>
> va_start(arg_ptr, fmt);
> vsprintf(string, fmt, arg_ptr);
> SendMsg(usr, string);
> va_end(arg_ptr);
> }
>
>
> void printit(int it)
> {
> time_t t, it2;
> struct tm *lt;
>
> it2 = (time_t)it;
> /*t = time(&it2);*/
> lt = localtime(&it2);
> printf("Current local time and date: %s", asctime(lt));
> }
>
>
> int main(int argc, char *argv[])
> {
> int rc, secs_hours, secs_mins, secs, sign, val;
> my_QWCRDTAA my;
> error_code_t ec;
> struct timeval tv;
> struct timezone tzp;
> char tmp[10], str_hours[3], str_mins[3], str_secs[3];
>
>
> ec.ec_fields.Bytes_Provided = sizeof(error_code_t);
>
> /*
> Retrieve data area contents.
> */
> QWCRDTAA(&my, sizeof(my), "OFFSET *LIBL ", -1, 6, &ec);
>
> /*
> double-check the type of the DTAARA. If it's not "*DEC" then
> forget it.
> */
> if (!strncmp(my.q.Type_Value_Returned, "*DEC", 4)) {
>
> /*
> Get the time of day from the system. If successful, try
> and set the time.
> Qp0zGetTimeofDay
> */
> if (gettimeofday(&tv, NULL) == 0) {
> printit(tv.tv_sec);
> printf("%d\n", tv.tv_sec);
> sign = 1;
> val = (int)my.dec;
> if (val < 0) {
> sign = -1;
> val = -val;
> }
>
> /*
> Convert decimal value to text
> */
> sprintf(tmp, "%06d", val);
>
> sprintf(str_hours, "%-02.2s", tmp);
> sprintf(str_mins, "%-02.2s", tmp + 2);
> sprintf(str_secs, "%-02.2s", tmp + 4);
>
> secs_hours = atoi(str_hours) * 3600;
> secs_mins = atoi(str_mins) * 60;
> secs = atoi(str_secs);
>
> /*
> Add (or subtract) the time.
> */
> tv.tv_sec += sign * (secs_hours + secs_mins + secs);
>
> /*
> Qp0zSetTimeofDay
> */
> if (settimeofday(&tv, NULL) != 0) {
> SendMsgf("QSYSOPR", "chgswdate LINE %d -
> settimeofday() failed", __LINE__);
> }
> printit(tv.tv_sec);
> printf("%d\n", tv.tv_sec);
> }
> }
> }